US6535182B2 - Head-mounted projection display system - Google Patents

Head-mounted projection display system Download PDF

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Publication number
US6535182B2
US6535182B2 US09/206,436 US20643698A US6535182B2 US 6535182 B2 US6535182 B2 US 6535182B2 US 20643698 A US20643698 A US 20643698A US 6535182 B2 US6535182 B2 US 6535182B2
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United States
Prior art keywords
viewer
projection display
image
eyes
head
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Expired - Fee Related
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US09/206,436
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US20010043165A1 (en
Inventor
Douglas A. Stanton
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Koninklijke Philips NV
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Koninklijke Philips Electronics NV
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Assigned to PHILIPS ELECTRONICS NORTH AMERICA CORPORATION reassignment PHILIPS ELECTRONICS NORTH AMERICA CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: STANTON, DOUGLAS A.
Priority to US09/206,436 priority Critical patent/US6535182B2/en
Priority to DE69935579T priority patent/DE69935579T2/en
Priority to EP99973332A priority patent/EP1053498B1/en
Priority to JP2000587217A priority patent/JP2002532919A/en
Priority to PCT/EP1999/009188 priority patent/WO2000034818A1/en
Publication of US20010043165A1 publication Critical patent/US20010043165A1/en
Assigned to KONINKLIJKE PHILIPS ELECTRONICS N.V. reassignment KONINKLIJKE PHILIPS ELECTRONICS N.V. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: PHILIPS ELECTRONICS NORTH AMERICA CORPORATION
Priority to US10/390,798 priority patent/US6982683B2/en
Publication of US6535182B2 publication Critical patent/US6535182B2/en
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    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09BEDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
    • G09B9/00Simulators for teaching or training purposes
    • G09B9/02Simulators for teaching or training purposes for teaching control of vehicles or other craft
    • G09B9/08Simulators for teaching or training purposes for teaching control of vehicles or other craft for teaching control of aircraft, e.g. Link trainer
    • G09B9/30Simulation of view from aircraft
    • G09B9/307Simulation of view from aircraft by helmet-mounted projector or display
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01Head-up displays
    • G02B27/017Head mounted
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01Head-up displays
    • G02B27/017Head mounted
    • G02B27/0172Head mounted characterised by optical features
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01Head-up displays
    • G02B27/0101Head-up displays characterised by optical features
    • G02B2027/0132Head-up displays characterised by optical features comprising binocular systems

Definitions

  • This invention relates to a head-mounted projection display system, and more particularly relates to such a display system in which the display is stereoscopic.
  • a variety of head-mounted displays are in use or have been proposed. Usually they involve a CRT or a spatial light modulator coupled to a source of light to create the display image. In the simplest versions, the images are viewed directly by the eye, assisted by suitable optics. See, for example, Japanese Kokai 4-34588 (A). Some versions permit the ambient environment to be viewed through the apparatus while information is added to the observer's view from the display. See, for example, U.S. Pat. No. 5,677,795.
  • a ground-based craft-flight simulator in which separate right and left light beams from a laser-scanning image generator are fed to right and left projection lenses mounted on a helmet above the eyes of a wearer-trainee, and projected onto a retro-reflective viewing screen.
  • a diffraction grating on the front of the screen adjusts the angle of the retro-reflected image, so that the projected beams are reflected onto a plane mirror mounted on the helmet between the projection lenses and the eyes of the viewer.
  • Motors mounted on the helment rotate the mirror, to achieve scanning of the reflected light beams onto the screen to build up the display image.
  • a simple low-power, head-mounted projection display system particularly one which provides stereoscopic viewing, would be useful in a variety of applications, notably virtual reality systems, useful, for example, in education, training, and/or entertainment.
  • a head-mounted projection display system comprising head gear including at least one low-power projector positioned such that the images from the projector are directed away from the viewer's eyes. More specifically, the projector is mounted so as to project an image in a direction along the viewer's line-of-sight. Preferably, a pair of projectors are mounted on opposite sides of the head gear, adjacent the viewer's eyes, and each projector is aimed to project an image in a direction along the viewer's line-of-sight.
  • the projected image is directed to a high-gain, retro-reflective viewing screen, which returns light from the low power projector(s) at sufficient brightness for the viewer to see the projected image(s). Due to the small angle of return (on the order of about 1-2 degrees), each eye sees only the image from its adjacent projector, enabling stereoscopic viewing in the event that separate images are projected by each projector, without the attenuation, temporal or optical manipulation common to known stereoscopic display systems.
  • the retro-reflective viewing screen is capable of having a wide viewing angle. This characteristic, together with the retro-reflectivity of the screen, permits a single viewer or multiple viewers, each with their own headgear, to see the same image or different images at large angles of view without significant degradation, making possible, for example, one or more viewers moving within the viewing space, or an audience of stationary viewers.
  • FIG. 1 is a perspective view of one embodiment of the projection system of the invention, including a pair of low power projectors mounted on headgear, and a high-gain, retro-reflective screen;
  • FIG. 2 is a schematic cross-section view of one of the low power projectors of FIG. 1;
  • FIG. 3 is a detailed cross-section view of a portion of the screen of FIG. 1;
  • FIG. 4 is a schematic representation of a spherical viewing room with transparent floor in accordance the invention.
  • two low power projectors 12 and 14 are mounted on the viewer's head close to each eye. Each projector is aimed at the viewing screen 16 along the direction of the line of sight of the adjacent eye of the viewer.
  • the projectors 12 and 14 are stabilized and referenced to the viewer's head by means of a headband 18 .
  • Possible alternative headgear include a hat or helmet.
  • the projectors each include a light source 20 , an electro-optical light modulator 22 , such as an LCD, and a projection lens 24 , in the arrangement shown schematically in FIG. 2 .
  • Light may alternatively be supplied from a remote light source, eg., via optical fibers.
  • Display information such as video or computer generated display signals, are supplied to the modulator 22 via electrical cables, not shown.
  • the viewing screen 16 is retro-reflective. That is, it returns all incident light back to the source within a narrow angle (about 1-2 degrees). Consequently, regardless of changes in the angle of incidence of the projected image caused by movement of the viewer's head, the screen will return the projected image to the viewer.
  • the viewing screen also advantageously can have a very high gain, as high as 1600, for example, enabling the viewer to see the projected image at adequate brightness, despite the low power of the projectors. This low power not only reduces the cost of the system relative to more complex high power systems, but also enables the use of battery powered operation, introducing portability and the possibility of inputting display information, such as computer generated information, by wireless link.
  • the screen could cover a portion of a wall or an entire wall or room.
  • the walls of the room could be curved, eg., cylindrical or spherical.
  • FIG. 4 shows a spherical room 40 enclosing a transparent floor 42 and viewer 44 .
  • such a room 40 could be used to project images 46 and 48 above and below viewer 44 , for example, to train astronauts, since it would create a perception of floating in space.
  • the screen is composed of a surface of an array of uniformly sized microspheres 30 , adhered to a substrate 34 by a reflective paint 32 .
  • the microspheres can be of any size above the wavelength of the light, and can also be of varying sizes.
  • One way of constructing a large screen surface would be to blow the microspheres onto a substrate having a previously applied tacky base, eg., wet reflective paint.
  • a previously applied tacky base eg., wet reflective paint.
  • one alternative to reflective microspheres is the so-called corner cube.
  • Retro-reflective screens are also commercially available. Two examples are the 3M Special Effects Projection screens #7610 and #7615.

Abstract

A head-mounted projection display system is characterized by a pair of head-mounted low-power image projectors mounted adjacent the eyes of the viewer, and aimed to project in a direction along the line of sight of the viewer toward a high-gain, retro-reflective screen. Stereoscopic viewing is enabled by projecting separate images to the right and left projectors. The retro-reflectivity of the screen ensures that the right and left images will be returned to the right and left eye, respectively.

Description

BACKGROUND OF THE INVENTION
This invention relates to a head-mounted projection display system, and more particularly relates to such a display system in which the display is stereoscopic.
A variety of head-mounted displays are in use or have been proposed. Usually they involve a CRT or a spatial light modulator coupled to a source of light to create the display image. In the simplest versions, the images are viewed directly by the eye, assisted by suitable optics. See, for example, Japanese Kokai 4-34588 (A). Some versions permit the ambient environment to be viewed through the apparatus while information is added to the observer's view from the display. See, for example, U.S. Pat. No. 5,677,795.
In UK patent application GB 2 043 940 A, a ground-based craft-flight simulator is described, in which separate right and left light beams from a laser-scanning image generator are fed to right and left projection lenses mounted on a helmet above the eyes of a wearer-trainee, and projected onto a retro-reflective viewing screen. A diffraction grating on the front of the screen adjusts the angle of the retro-reflected image, so that the projected beams are reflected onto a plane mirror mounted on the helmet between the projection lenses and the eyes of the viewer. Motors mounted on the helment rotate the mirror, to achieve scanning of the reflected light beams onto the screen to build up the display image.
As will be appreciated, this system is complex and would be expensive to implement, limiting its applicability to specialized uses such as military or commercial pilot training.
A simple low-power, head-mounted projection display system, particularly one which provides stereoscopic viewing, would be useful in a variety of applications, notably virtual reality systems, useful, for example, in education, training, and/or entertainment.
OBJECTS AND SUMMARY OF THE INVENTION
Accordingly, it is an object of the invention to provide a simple, low-power, head-mounted projection display system.
It is another object of the invention to provide such a head-mounted projection display system in which stereoscopic viewing is possible.
In accordance with one aspect of the invention, there is provided a head-mounted projection display system comprising head gear including at least one low-power projector positioned such that the images from the projector are directed away from the viewer's eyes. More specifically, the projector is mounted so as to project an image in a direction along the viewer's line-of-sight. Preferably, a pair of projectors are mounted on opposite sides of the head gear, adjacent the viewer's eyes, and each projector is aimed to project an image in a direction along the viewer's line-of-sight.
The projected image is directed to a high-gain, retro-reflective viewing screen, which returns light from the low power projector(s) at sufficient brightness for the viewer to see the projected image(s). Due to the small angle of return (on the order of about 1-2 degrees), each eye sees only the image from its adjacent projector, enabling stereoscopic viewing in the event that separate images are projected by each projector, without the attenuation, temporal or optical manipulation common to known stereoscopic display systems.
The retro-reflective viewing screen is capable of having a wide viewing angle. This characteristic, together with the retro-reflectivity of the screen, permits a single viewer or multiple viewers, each with their own headgear, to see the same image or different images at large angles of view without significant degradation, making possible, for example, one or more viewers moving within the viewing space, or an audience of stationary viewers.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of one embodiment of the projection system of the invention, including a pair of low power projectors mounted on headgear, and a high-gain, retro-reflective screen;
FIG. 2 is a schematic cross-section view of one of the low power projectors of FIG. 1;
FIG. 3 is a detailed cross-section view of a portion of the screen of FIG. 1; and
FIG. 4 is a schematic representation of a spherical viewing room with transparent floor in accordance the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
In FIG. 1, two low power projectors 12 and 14 are mounted on the viewer's head close to each eye. Each projector is aimed at the viewing screen 16 along the direction of the line of sight of the adjacent eye of the viewer. The projectors 12 and 14 are stabilized and referenced to the viewer's head by means of a headband 18. Possible alternative headgear include a hat or helmet.
The projectors each include a light source 20, an electro-optical light modulator 22, such as an LCD, and a projection lens 24, in the arrangement shown schematically in FIG. 2. Light may alternatively be supplied from a remote light source, eg., via optical fibers. Display information, such as video or computer generated display signals, are supplied to the modulator 22 via electrical cables, not shown.
The viewing screen 16 is retro-reflective. That is, it returns all incident light back to the source within a narrow angle (about 1-2 degrees). Consequently, regardless of changes in the angle of incidence of the projected image caused by movement of the viewer's head, the screen will return the projected image to the viewer. The viewing screen also advantageously can have a very high gain, as high as 1600, for example, enabling the viewer to see the projected image at adequate brightness, despite the low power of the projectors. This low power not only reduces the cost of the system relative to more complex high power systems, but also enables the use of battery powered operation, introducing portability and the possibility of inputting display information, such as computer generated information, by wireless link.
Depending upon the application, the screen could cover a portion of a wall or an entire wall or room. The walls of the room could be curved, eg., cylindrical or spherical. For example, FIG. 4 shows a spherical room 40 enclosing a transparent floor 42 and viewer 44. In the stereoscopic mode of the invention, such a room 40 could be used to project images 46 and 48 above and below viewer 44, for example, to train astronauts, since it would create a perception of floating in space.
In one embodiment, shown in FIG. 3, the screen is composed of a surface of an array of uniformly sized microspheres 30, adhered to a substrate 34 by a reflective paint 32. The microspheres can be of any size above the wavelength of the light, and can also be of varying sizes. One way of constructing a large screen surface would be to blow the microspheres onto a substrate having a previously applied tacky base, eg., wet reflective paint. As is known, one alternative to reflective microspheres is the so-called corner cube. Retro-reflective screens are also commercially available. Two examples are the 3M Special Effects Projection screens #7610 and #7615.
The invention has been described in terms of a limited number of embodiments. Other embodiments, variations of embodiments and art-recognized equivalents will become apparent to those skilled in the art, and are intended to be encompassed within the scope of the invention, as set forth in the appended claims.

Claims (3)

What I claim as my invention is:
1. A stereoscopic projection display method, comprising:
projecting a first image in the line-of-sight of a viewer from a first projector including an electro-optical light modulator and a projection lens at a first location adjacent to a first one of viewer's eyes, onto a retroreflective projection display screen;
projecting a second image in the line-of-sight of the viewer from a second location adjacent to a second one of viewer's eyes, onto the retroreflective projection display screen; and
making the line-of-sight directions of projecting the first and second images dependent on the position of the viewer's head, such that said directions change with the line-of-sight of the viewer as the viewer's head moves,
such that:
the electro-optical light modulator and the projection lens are disposed on a headset to be worn by the viewer during said projecting of the first and second images;
the position of the retroreflective projection display screen is independent of the position of the viewer's head;
the first image and the second image comprise differing perspective views, so that the viewer experiences a stereoscopic image effect;
the first image is reflected from the retroreflective projection display screen to the first one of viewer's eyes but not to the second one of viewer's eyes; and
the second image is reflected from the retroreflective projection display screen to the second one of viewer's eyes but not to the first one of viewer's eyes.
2. The method of claim 1, further comprising forming the retroreflective projection display screen on a wall of a room.
3. The method of claim 2, further comprising placing a transparent platform in the room so that the viewer can stand on the transparent platform and view images reflected from portions of the retroreflective projection display screen both above and below the transparent platform.
US09/206,436 1998-12-07 1998-12-07 Head-mounted projection display system Expired - Fee Related US6535182B2 (en)

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Application Number Priority Date Filing Date Title
US09/206,436 US6535182B2 (en) 1998-12-07 1998-12-07 Head-mounted projection display system
PCT/EP1999/009188 WO2000034818A1 (en) 1998-12-07 1999-11-24 Head-mounted projection display system
EP99973332A EP1053498B1 (en) 1998-12-07 1999-11-24 Head-mounted projection display system
JP2000587217A JP2002532919A (en) 1998-12-07 1999-11-24 Head mounted projection display device
DE69935579T DE69935579T2 (en) 1998-12-07 1999-11-24 HEAD-MOUNTED PROJECTION DISPLAY SYSTEM
US10/390,798 US6982683B2 (en) 1998-12-07 2003-03-18 Head-mounted projection display system

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US10/390,798 Expired - Fee Related US6982683B2 (en) 1998-12-07 2003-03-18 Head-mounted projection display system

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US20010043165A1 (en) 2001-11-22
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US20030179157A1 (en) 2003-09-25
WO2000034818A1 (en) 2000-06-15
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JP2002532919A (en) 2002-10-02
US6982683B2 (en) 2006-01-03

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